[Equest-users] CT Recirc air and quantifying energy penalty in equest for increased entering WB Temp

[Nikola Kravik]

Hi Robby,
Thanks for your email. We will do trending but was hoping that we can also get some numbers out of equest.

Has anybody else even tried to model the below?
Best,
Nikola

Nikola Kravik, LEED AP [cid:image001.gif at 01CD6596.FD164F90]
Project Engineer

Willdan Energy Solutions
6130 Stoneridge Mall Road, Suite 380
Pleasanton, CA 94588
T. 925.416.4200 ext. 1228
D. 925.416.4228
C. 925.719.5883
F. 925.737.0174
nkravik at willdan.com<mailto:nkravik at willdan.com>
www.willdan.com/energy<http://www.willdan.com/energy>

[cid:image002.jpg at 01CD6596.FD164F90]

From: Robby Oylear [mailto:robbyoylear at gmail.com]
Sent: Wednesday, July 18, 2012 4:21 PM
To: Nikola Kravik
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] CT Recirc air and quantifying energy penalty in equest for increased entering WB Temp

This might be a situation where you want to use actual energy readings.  If they have a consistent load (or maybe you can false load the system somehow) you could take power readings or run some trends at night when the "effective" wet bulb in that built-up well would be closer to what you'd see if the tower was open to ambient air.  Compare the two power usage measurements/trends and there's your savings.

If the tower fans have VFD's you should already have power metering capability.

Robby Oylear, PE, LEED AP
Mechanical Engineer
Senior Energy Analyst

D 206-788-4571
www.rushingco.com<http://www.rushingco.com/>

On Wed, Jul 18, 2012 at 3:55 PM, Nikola Kravik <NKravik at willdan.com<mailto:NKravik at willdan.com>> wrote:
Hi,
I have a project designed with a WSHP/Fluid cooler where the 2 cell FCooler was put in a "cage of wall" (so neighbors don't hear the sound db's).

Well the sound may be lower, but they have bigger issues with the recirc air and elevated wet bulb around the tower, contractor did measurements and instead of 72F EAWB is about 77F.
95/85 design though with the wet bulb at 77-78F, tower is doing 101/91F+.

I tried to quantify the penalty for the decreased capacity (or the other way around the get savings if we knock the wall and bring the db back to 72F) by playing with the approach temp (from the design 13F to 19F) under the FCooler but that didn't make a difference.

Then I tried the CW loop, elevating the CHW Temp to simulate increased FCooler Leaving supply temp from designed 85F to 90+F and that yield about 100Kwh savings but now sure if this is the right way to do it in equest -has anybody attempted something similar in equest and got justifiable results? Would you recommend doing it some other way in equest?

Thank you,
Nikola


[cid:image003.png at 01CD6596.FD164F90]
[cid:image004.jpg at 01CD6596.FD164F90]
[cid:image005.jpg at 01CD6596.FD164F90]
Nikola Kravik, LEED AP [cid:image001.gif at 01CD6596.FD164F90]
Project Engineer

Willdan Energy Solutions
6130 Stoneridge Mall Road, Suite 380
Pleasanton, CA 94588
T. 925.416.4200 ext. 1228<tel:925.416.4200%20ext.%201228>
D. 925.416.4228<tel:925.416.4228>
C. 925.719.5883<tel:925.719.5883>
F. 925.737.0174<tel:925.737.0174>
nkravik at willdan.com<mailto:nkravik at willdan.com>
www.willdan.com/energy<http://www.willdan.com/energy>

[cid:image002.jpg at 01CD6596.FD164F90]


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